Delete grpc shared objects pulled in by gitaly

What does this MR do?

From time to time, gitaly and gitlab-rails will vary the version of grpc depended on.

Copy the grpc pruning from gitlab-rails into gitaly software definition.

Fixes the build healthcheck

Checklist

See Definition of done.

• Change added to CHANGELOG.md. Not applicable for Documentation changes and minor changes.
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA, if applicable
• MR targeting master branch
• MR has a green pipeline on GitLab.com

Reviewer Checklist

In addition to above, reviewer must:

• Pipeline is green on dev.gitlab.org if the change is not touching documentation or internal cookbooks

References